Effect of fluidizers on the performance of cold-sprayed zinc coatings (2)

2.3 Effect of rheoid additives on coating adhesion
Use of storage stability of rheumate additives Degusse R974, WACKER N20, touch-variant anti-sink resin according to the basic formula table 1 paint, and in 6 mm thickness 45 RZ roughness steel plate plate, control dry film thickness (80 x 10) sm, at a temperature of 23 degrees C humidity 45% constant greenhouse maintenance 3 d, began to detect the pull-out adhesion and zoning adhesion, test results can be seen in Table 4.. As can be seen from Table 4, the coating film adhesion made of touch-variant anti-sink resin is the best. Therefore, cold-sprayed zinc coatings use touch-variant anti-sink resins as fluidizers.2.4 Effect of rheumor additives on composite coating matching In the experiment, gas-phase silicon dioxide (Degusse R974/R805/R200, WACKER N20, Cabot TS720), bentonite GARAMITE1958, polyyubyK410, polyamide wax were used respectively DISPARLON1068, touch-variant anti-sink resin (homemade) as a cold zinc spray coating fluid aid prepared into a cold zinc spray coating, and sprayed on the workware, at a temperature of 23 degrees C, humidity of 45% of the environment after 4 h completely solid, at this time sprayed double-component acrylic polyurethane paint, matching surface 5.. The scanning electron microscope (SEM) was used to test the cold-sprayed zinc coating of the anti-sinking aid with better storage stability, and the micromorphisms of Degusse R974, WACKER N20 and tactisor anti-sink resin were analyzed, and the results were shown in Figure 2 to Figure 4.. From Figure 2 to Figure 4, it can be seen that figure 4 scanning image tacthragm anti-sink resin prepared cold-sprayed zinc coating spout zinc accumulation is more dense and neat, Figure 4 can spectrum image tacthragm anti-sink resin zinc content is the highest, this high-content zinc powder neat accumulation structure close to high temperature steam galvanizing or even electroplating state, for coating and steel structure contact formed "Alloy "provides the possibility that this dense structure can optimize the traditional zinc-rich paint base in the three-coat supporting system, so that primers and finishes can be directly matched, saving the two-component intermediate coating coating coating and maintenance time, greatly shorten the coating cycle, reduce labor costs and time costs, easy to line tight period of galvanized work parts coating. In the course of practical application, we find that the dense structure of cold-sprayed zinc coating not only optimizes the supporting system, but also greatly improves the resistance due to blunt instrument bruising and sharp instrument scratching. Downstream construction using excavator loading and unloading process to damage the integrity of the coating, other types of fluidizers made of the coating will inevitably produce depression or even dew bottom;2.5 Effect of rheumoride additives on single coating resistance to neutral salt spray performance Use storage stability good rheumate additive Degusse R974, touch variant anti-sink resin according to reference formula 1 paint, and in thickness 6 mm roughness Rz45 steel plate, control dry film thickness (80 x 10) m, at a temperature of 23 degrees C humidity 45% constant greenhouse maintenance 7 d, to do neutral salt spray test. Figure 5 (a) and (b) are cold-sprayed zinc-resistant coatings made of R974 and cold-sprayed zinc-resistant test plate surfaces made of tactillin anti-sink resins, respectively.as can be seen from Figure 5, the coating prepared by R974 4,000 h neutral salt mist is produced by white rust, no abnormality made of anti-flow hanging resin; The resin-made coating has fewer pores between the tight zinc powders, providing excellent shielding for the coating, inhibiting the rapid diffusion of corrosive media, delaying the corrosion of zinc powder, with almost no white zinc rust on the surface, and significantly improving the corrosion resistance of the coating. Touch-variant anti-sink resins are also superior to gas-phase silica in the neutral salt spray of cold-sprayed zinc coatings.
2.6 performance test results . In accordance with Q/SBTS 172-2017 "Shanxi Baotashan Paint Co., Ltd. cold zinc spray coating" standard related requirements for testing, the results are shown in Table 6.. As can be found from Table 6, all performance meets the requirements of design indicators, in which excellent adhesion and salt spray resistance make cold zinc spray coatings in steel structure long-lasting corrosion prevention has a broader application prospects and market competitiveness.3 Conclusion This study used homemade tact control anti-sink resin as a fluidizer to prepare a cold-sprayed zinc coating with long-lasting anti-corrosion properties, with fast dryness, short coating cycle and excellent resistance to neutral salt spray, and overcome the traditional zinc-rich Coating porous structural shortcomings, optimize the traditional zinc-rich paint base in the medium three-coat matching system, so that primers and finishes can directly support the reduction of two-component intermediate coating coating coating and maintenance time, greatly shorten the coating cycle to reduce labor costs and time costs, easy to line tight period of galvanizing coating. With the promulgation of the 2015 industry standard for cold-coated zinc coatings, cold-sprayed zinc coatings will gradually replace hot-galvanized and hot-sprayed zinc, and will have a broader application prospect in anti-corrosion coating of steel structures such as CHINA COATINGS roads, power facilities, transportation facilities, etc. in iron-China coatings®
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